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REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements (Narrative) (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2006 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.1050 | 0.1050 |
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00% |
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum | 0.0400 | 0.0400 |
Value Of Trust Preferred Securities Included In Tier One Capital | $ 63,000 | $ 43,000 |
Subordinated Debt | 61,365 | $ 44,331 | $ 44,300
Northway Financial, Inc "NFI" |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Subordinated Debt | $ 20,600 |  |
Minimum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.080 |  |
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.060 |  |
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% |  |
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum | 0.040 |  |

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- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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